We provide a simple construction of social choice rules for economies with infinite populations . The rules are continuous, Pareto and nondictatorial ; they are constructed as limits of individual preferences when the limit exists, and otherwise as adequate generalizations . This contrasts with the impossibility results of Arrow (1951) and Chichilnisky (1980) , which are valid on economies with finitely many individuals . Our social choice rules are, however, limits of dictatorial rules. This paper was written in 1979 .